Why XML validation error?

Question

XML

Please tell me what is wrong.

<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="timeTable">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="offices">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="office" minOccurs="1" maxOccurs="unbounded">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element name="name" type="xs:string" />
                    <xs:element name="address" type="xs:string" />
                  </xs:sequence>
                  <xs:attribute name="code" type="xs:string" use="required" />
                </xs:complexType>
              </xs:element>
            </xs:sequence>
          </xs:complexType>
        </xs:element>
        <xs:element name="lesson" minOccurs="1" maxOccurs="unbounded">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="date" type="xs:date" />
              <xs:element name="time" type="xs:time" />
            </xs:sequence>
            <xs:attribute name="no" type="xs:ID" use="required" />
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

<?xml version="1.0" encoding="UTF-8"?>
<timeTable
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xsi:noNamespaceSchemaLocation="lab-3-2.xsd">
>
  <offices>
    <office code="БК">
      <name>Комплекс "Бакунинский"</name>
      <address>ул. Бакунинская, 71</address>
    </office>
    <office code="РА">
      <name>Комплекс "Радио"</name>
      <address>ул. Радио, д. 24</address>
    </office>
  </offices>
  <lesson no="id1">
    <date>2013-07-06</date>
    <time>18:30:00</time>
  </lesson>
  <lesson no="id2">
    <date>2013-07-10</date>
    <time>18:30:00</time>
  </lesson>
  <lesson no="id3">
    <date>2013-07-11</date>
    <time>18:30:00</time>
  </lesson>
</timeTable>

It gives
Validation of current file using XML schema:
ERROR: Element 'timeTable': Character content other than whitespace is not allowed because the content type is 'element-only'.